Method of making tubes for automobile-tires.



G. C. BERRYMAN METHOD OF MAKING TUBES FOR AUTCMOBILE TIRES.

, APPLICATION FILED AUG-28', 19l6.

Patented N v. 6, 1917.

enovnn'o. Brenna/MAN, OELOS ANGELE$, oamronura.

METHOD OF MAKING TUBES FOR AUTOMOBILE TIEES.

I To all whom it may concern:

Be it known that I, GROVER C. BERRYMAN,

v a eitizenof the United States, residing at Lei; Angeles, in the county of Los Angeles and-State of California, have invented new and useful Improvements in Methods ofv 'Making Tubes for 'Automobile-Tires, of which the following is a specification.

My. invention relatesto a tube for auto mobile tires and a method; of making the same. i

It is an object of my invention to'provide a tube for an automobile tire which is seamless and which is made integral.

Another object of my invention is to provide a tube having relatively thick walls and a thickened outer peripheral portion thereby providing a wall adjacent the tread portion of the tire which is not easily punctured. v 1

It is another object of my invention. to provide a method for producing a finished tube possessing the characteristics above de- 11 scribed. I

'. shoe or outer casing. The ordinary innertube is thin-walled having the ends closed My tire may be used with or without a and cemented to provide a closed chamber which may be inflated. Such a tube has a tendency to creep within the outer casing tearing the tire valve from the tube and wearing the walls thereof by the uneven strains placed upon them. Furthermore, such tubes are easily punctured causing the outer casing to collapse. With my improved construction, puncturing of the in ner-tube is diflicult but if such punctur ,should occur, it would not cause a complete collapse, and consequently injury to the {outer casing will be avoided.

With the above and other objects in view which will appear as the description proceeds, my invention consists in the construction and arrangement of parts and in the steps of the method of making the same, hereinafter described and claimed.

'In the accompanying drawings which form a part of this specification I have illustrated an embodiment of my invention and the manner in which the tube ismanufac- :tured.

v Figure 1 is a transverse cross-section of an automobile tire showing my improved tube surrounded by an outer casing and mounted on the rim ,of an automobile wheel.

Fig. 2 is a vertical cross-section showing Specification of Letters Patent.

Patented Nov. 6, 1917.

' 'Application filed August 2a, 1916. Serial No. 11min.

the formation of the tubular air chamber formed about a cylindrical mandrel. Flg. 3 is 'a cross-section showing the manner of attachingthe tubular air c am er to the main body portion of the tube,

Fig. 4 is a cross section showing the main body portion inclosing the tubular air chamber, the mairi body portion b ing pr vided with a fabric cemented on s p riphery, the wholetube being wrapped about with sheets of rubber.

Fig. 5 is a side elevation of the tire mounted on the mandrel.

Fig. 6 isthe cross-section of the air tube within a vulcanizing mold.

Fig. 7 is a side elevation of the complet tube. 1

tubular air chamber 11. The Walls 14: 0f til main body portion 12 adjacent to tha groove 13 are tapered as clearly shown in Fig 3, and terminate in three cornered end 15 adapted to completely inclose the tubular air chamber. Before inserting the tubular air chamber into the longitudinal groove 13 a rubber cement is applied to the Outer Walls of said chamber and also on the inner-walls of the groove 13. I The tapered nd walls. 1% of the main body portion are then ressed toward one another to completely incense the tubular air chamber 11 as shown in' Fig. 4. Next I cement a stout sheet of textile fabric 16 on the outer periphery of the main body portion 12 but leaving the side edges of the tube which engages the rim of the automobile wheel free. About the entire body of the tube as assembled on the mandrelI now wrap in a spiral manner about two layers of h gh grade rubbersheeting. The next step is to remove the tube from the mandrel,

- cut the ends thereof beveled for splicing and stem. The assembled tube is now placed within a vulcanizing mold 19, of any suitable construction and which is provided with a hollow heating chamber 20. The tubular chamber '11 is submitted to a fluid pressure of 60 pounds. Either air, water or ammonia may be used in the inflation of said tube. Steam having a pressure of about 60 lbs. is supplied to the heating chamber 20 and the tube is submitted to this curing process for about I hours, whereby the air chamber 11 and the main body portion 12 are vulcanized into a unitary integral tire tube.

It should be noted that the tube is provided with a textile fabric embedded adjacent to the outer periphery thereof except at its side edges which engages the rim of the automobile allowing for expansion at this place when the air chamber is inflated.

I claim: 1

1. A method of making a tube for pneumatic tires comprising winding sheets of rubber several times about a cylindrical mandrel to form a-tube, inserting said air tube into a longitudinal groove of a cylindrical shaped main body portion of rubber, cementing said tube to the inner wall of said groove, cementing a sheet of textile fabric on said main body portion but leaving said groove open, winding a sheet of rubber comfiepteo at? this patent may he obtained fer five cents each, by addressing Washington, I). it.

r leases pressure and curing the assembled tire in the usual manner.

2. A method of making a tube for pneumatic tires comprisingwinding a sheet of rubber about a cylindrical mandrel to form a tube, inserting said tube into a longitudinal groove formed in a main body portion of rubber, cementing said tube to the inner walls of said groove, winding a sheet of rubber completely about the main body portion and causing the walls of said groove to completely lnclose said tube, removlng sald mandrel from said tube, thereby forming an air chamber, splicing the ends of the as-.

senibled tire together to form a ring shaped endless tire, inserting a valve stem in said air chamber, placing said air chamber under fluid pressure, and curing the assembled tire in the usual manner.

In testimony whereof l have signed my name to this specification.

GROVER C. BERRYMAN.

the "fiozsnaiaafiener of Eatents. 

